[EnergyPlus_Support] Re: heat exchanger:Air to air: general

["donbshireyiii" <shirey@xxxxxxxxxxxx>]

In addition, look at the E+ Engineering Document page 319 (page 346 of
413 in the pdf file) for an explanation of how Heat Exchanger:Air To
Air:Generic works with an air-side economizer.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "donbshireyiii"
<shirey@f...> wrote:
> Please upload your idf file to the EnergyPlus yahoogroups web site
> (http://groups.yahoo.com/group/EnergyPlus_Support/) or send it
> EnergyPlus-Support@g... and we'll take a quick look at it.
> 
> If the temperature of the relief air is greater than the temperature
> of the incoming outdoor ventilation air, then you will see a
positive
> value.
> 
> What weather file are you using?
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Joseph Lewis
> <fortierengineer@y...> wrote:
> > Hello,
> >  
> > I have a heat exchanger:air to air:general in a model that only
> transfers sensible heat between the relief airflow and the outdoor
air
> flow.  Running it in the summer design day, I have discovered that
no
> matter what control strategy for the out door air system, there are
> hours where the "Heat Exchanger Sensible Heating Rate" is positive.
 I
> have looked at the  HVACStandAloneERV_Economizer.idf example for
help,
>  and it has the same issue.   I have also looked at
DesiccantCVRh.idf
> and in this file the sensible heating rate is zero for the summer, 
> but if I remove the desiccant unit from the loop you have the same
> issue.  
> >  
> > Is there a control strategy that can be used along with an outdoor
> air controller (with economizer) to eliminate this? 
> >  
> > Thank you,
> >  
> > Joe Lewis



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